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/**************************************************************************
copyright : (C) 2007 by Lukáš Lalinský
email : lalinsky@gmail.com
**************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef WITH_MP4
#include <tdebug.h>
#include <tstring.h>
#include "mp4file.h"
#include "mp4atom.h"
#include "mp4properties.h"
using namespace TagLib;
class MP4::Properties::PropertiesPrivate
{
public:
PropertiesPrivate() : length(0), bitrate(0), sampleRate(0), channels(0), bitsPerSample(0), encrypted(false) {}
int length;
int bitrate;
int sampleRate;
int channels;
int bitsPerSample;
bool encrypted;
};
MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
: AudioProperties(style)
{
d = new PropertiesPrivate;
MP4::Atom *moov = atoms->find("moov");
if(!moov) {
debug("MP4: Atom 'moov' not found");
return;
}
MP4::Atom *trak = 0;
ByteVector data;
MP4::AtomList trakList = moov->findall("trak");
for (unsigned int i = 0; i < trakList.size(); i++) {
trak = trakList[i];
MP4::Atom *hdlr = trak->find("mdia", "hdlr");
if(!hdlr) {
debug("MP4: Atom 'trak.mdia.hdlr' not found");
return;
}
file->seek(hdlr->offset);
data = file->readBlock(hdlr->length);
if(data.mid(16, 4) == "soun") {
break;
}
trak = 0;
}
if (!trak) {
debug("MP4: No audio tracks");
return;
}
MP4::Atom *mdhd = trak->find("mdia", "mdhd");
if(!mdhd) {
debug("MP4: Atom 'trak.mdia.mdhd' not found");
return;
}
file->seek(mdhd->offset);
data = file->readBlock(mdhd->length);
if(data[8] == 0) {
unsigned int unit = data.mid(20, 4).toUInt();
unsigned int length = data.mid(24, 4).toUInt();
d->length = length / unit;
}
else {
long long unit = data.mid(28, 8).toLongLong();
long long length = data.mid(36, 8).toLongLong();
d->length = int(length / unit);
}
MP4::Atom *atom = trak->find("mdia", "minf", "stbl", "stsd");
if(!atom) {
return;
}
file->seek(atom->offset);
data = file->readBlock(atom->length);
if(data.mid(20, 4) == "mp4a") {
d->channels = data.mid(40, 2).toShort();
d->bitsPerSample = data.mid(42, 2).toShort();
d->sampleRate = data.mid(46, 4).toUInt();
if(data.mid(56, 4) == "esds" && data[64] == 0x03) {
long pos = 65;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 4;
if(data[pos] == 0x04) {
pos += 1;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 10;
d->bitrate = (data.mid(pos, 4).toUInt() + 500) / 1000;
}
}
}
else if (data.mid(20, 4) == "alac") {
if (atom->length == 88 && data.mid(56, 4) == "alac") {
d->bitsPerSample = data.at(69);
d->channels = data.at(73);
d->bitrate = data.mid(80, 4).toUInt() / 1000;
d->sampleRate = data.mid(84, 4).toUInt();
}
}
MP4::Atom *drms = atom->find("drms");
if(drms) {
d->encrypted = true;
}
}
MP4::Properties::~Properties()
{
delete d;
}
int
MP4::Properties::channels() const
{
return d->channels;
}
int
MP4::Properties::sampleRate() const
{
return d->sampleRate;
}
int
MP4::Properties::length() const
{
return d->length;
}
int
MP4::Properties::bitrate() const
{
return d->bitrate;
}
int
MP4::Properties::bitsPerSample() const
{
return d->bitsPerSample;
}
bool
MP4::Properties::isEncrypted() const
{
return d->encrypted;
}
#endif
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